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annotate src/luan/lib/BasicLib.java @ 39:e5bcb1eeafc1

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change naming convention git-svn-id: https://luan-java.googlecode.com/svn/trunk@40 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Thu, 20 Dec 2012 02:54:06 +0000
parents 8a57ebfdfd78
children e3624b7cd603
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1 package luan.lib;
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2
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3 import java.io.File;
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4 import java.io.Reader;
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5 import java.io.FileReader;
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6 import java.io.InputStreamReader;
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7 import java.io.IOException;
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8 import java.lang.reflect.Method;
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9 import java.util.Iterator;
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10 import java.util.Map;
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11 import luan.Lua;
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12 import luan.LuaState;
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13 import luan.LuaTable;
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14 import luan.LuaNumber;
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15 import luan.LuaFunction;
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16 import luan.LuaJavaFunction;
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17 import luan.LuaException;
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18 import luan.interp.LuaCompiler;
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20
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21 public final class BasicLib {
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23 public static void register(LuaState lua) {
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24 LuaTable global = lua.global();
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25 global.put( "_G", global );
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26 add( global, "do_file", LuaState.class, String.class );
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27 add( global, "get_metatable", LuaState.class, Object.class );
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28 add( global, "ipairs", LuaTable.class );
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29 add( global, "load", LuaState.class, String.class );
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30 add( global, "load_file", LuaState.class, String.class );
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31 add( global, "pairs", LuaTable.class );
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32 add( global, "print", LuaState.class, new Object[0].getClass() );
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33 add( global, "raw_equal", Object.class, Object.class );
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34 add( global, "raw_get", LuaTable.class, Object.class );
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35 add( global, "raw_len", Object.class );
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36 add( global, "raw_set", LuaTable.class, Object.class, Object.class );
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37 add( global, "set_metatable", LuaTable.class, LuaTable.class );
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38 add( global, "to_number", Object.class, Integer.class );
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39 add( global, "to_string", LuaState.class, Object.class );
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40 add( global, "type", Object.class );
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41 global.put( "_VERSION", Lua.version );
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43 add( global, "make_standard", LuaState.class );
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44 }
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46 private static void add(LuaTable t,String method,Class<?>... parameterTypes) {
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47 try {
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48 t.put( method, new LuaJavaFunction(BasicLib.class.getMethod(method,parameterTypes),null) );
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49 } catch(NoSuchMethodException e) {
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50 throw new RuntimeException(e);
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51 }
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52 }
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54 public static void make_standard(LuaState lua) {
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55 LuaTable global = lua.global();
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56 global.put( "dofile", global.get("do_file") );
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57 global.put( "getmetatable", global.get("get_metatable") );
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58 global.put( "loadfile", global.get("load_file") );
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59 global.put( "rawequal", global.get("raw_equal") );
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60 global.put( "rawget", global.get("raw_get") );
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61 global.put( "rawlen", global.get("raw_len") );
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62 global.put( "rawset", global.get("raw_set") );
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63 global.put( "setmetatable", global.get("set_metatable") );
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64 global.put( "tonumber", global.get("to_number") );
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65 global.put( "tostring", global.get("to_string") );
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66 }
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67
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68 public static void print(LuaState lua,Object... args) throws LuaException {
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69 for( int i=0; i<args.length; i++ ) {
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70 if( i > 0 )
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71 System.out.print('\t');
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72 System.out.print( lua.toString(args[i]) );
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73 }
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74 System.out.println();
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75 }
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76
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77 public static String type(Object obj) {
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78 return Lua.type(obj);
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79 }
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80
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81 public static LuaFunction load(LuaState lua,String ld) throws LuaException {
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82 return LuaCompiler.compile(lua,ld);
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83 }
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84
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85 public static String readAll(Reader in)
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86 throws IOException
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87 {
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88 char[] a = new char[8192];
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89 StringBuilder buf = new StringBuilder();
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90 int n;
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91 while( (n=in.read(a)) != -1 ) {
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92 buf.append(a,0,n);
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93 }
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94 return buf.toString();
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95 }
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96
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97 public static String read(File file)
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98 throws IOException
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99 {
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100 Reader in = new FileReader(file);
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101 String s = readAll(in);
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102 in.close();
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103 return s;
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104 }
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105
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106
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107 public static LuaFunction load_file(LuaState lua,String fileName) throws LuaException,IOException {
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108 String src = fileName==null ? readAll(new InputStreamReader(System.in)) : read(new File(fileName));
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109 return load(lua,src);
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110 }
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111
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112 public static Object[] do_file(LuaState lua,String fileName) throws LuaException,IOException {
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113 return load_file(lua,fileName).call(lua);
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114 }
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115
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116 private static class TableIter {
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117 private final Iterator<Map.Entry<Object,Object>> iter;
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118
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119 TableIter(Iterator<Map.Entry<Object,Object>> iter) {
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120 this.iter = iter;
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121 }
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122
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123 public Object[] next() {
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124 if( !iter.hasNext() )
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125 return LuaFunction.EMPTY_RTN;
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126 Map.Entry<Object,Object> entry = iter.next();
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127 return new Object[]{entry.getKey(),entry.getValue()};
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128 }
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129 }
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130 private static final Method nextTableIter;
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131 static {
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132 try {
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133 nextTableIter = TableIter.class.getMethod("next");
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134 nextTableIter.setAccessible(true);
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135 } catch(NoSuchMethodException e) {
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136 throw new RuntimeException(e);
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137 }
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138 }
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139
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140 static LuaFunction pairs(Iterator<Map.Entry<Object,Object>> iter) {
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141 TableIter ti = new TableIter(iter);
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142 return new LuaJavaFunction(nextTableIter,ti);
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143 }
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144
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145 public static LuaFunction pairs(LuaTable t) {
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146 return pairs(t.iterator());
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147 }
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148
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149 private static class ArrayIter {
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150 private final LuaTable t;
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151 private double i = 0.0;
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152
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153 ArrayIter(LuaTable t) {
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154 this.t = t;
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155 }
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156
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157 public Object[] next() {
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158 LuaNumber n = new LuaNumber(++i);
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159 Object val = t.get(n);
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160 return val==null ? LuaFunction.EMPTY_RTN : new Object[]{n,val};
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161 }
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162 }
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163 private static final Method nextArrayIter;
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164 static {
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165 try {
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166 nextArrayIter = ArrayIter.class.getMethod("next");
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167 nextArrayIter.setAccessible(true);
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168 } catch(NoSuchMethodException e) {
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169 throw new RuntimeException(e);
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170 }
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171 }
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172
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173 public static LuaFunction ipairs(LuaTable t) {
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174 ArrayIter ai = new ArrayIter(t);
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175 return new LuaJavaFunction(nextArrayIter,ai);
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176 }
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177
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178 public static LuaTable get_metatable(LuaState lua,Object obj) {
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179 return lua.getMetatable(obj);
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180 }
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181
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182 public static LuaTable set_metatable(LuaTable table,LuaTable metatable) {
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183 table.setMetatable(metatable);
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184 return table;
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185 }
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186
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187 public static boolean raw_equal(Object v1,Object v2) {
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188 return v1 == v2 || v1 != null && v1.equals(v2);
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189 }
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190
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191 public static Object raw_get(LuaTable table,Object index) {
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192 return table.get(index);
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193 }
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194
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195 public static LuaTable raw_set(LuaTable table,Object index,Object value) {
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196 table.put(index,value);
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197 return table;
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198 }
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199
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200 public static int raw_len(Object v) throws LuaException {
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201 if( v instanceof String ) {
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202 String s = (String)v;
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203 return s.length();
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204 }
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205 if( v instanceof LuaTable ) {
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206 LuaTable t = (LuaTable)v;
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207 return t.length();
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208 }
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209 throw new LuaException( "bad argument #1 to 'raw_len' (table or string expected)" );
36
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210 }
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211
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212 public static LuaNumber to_number(Object e,Integer base) {
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213 return Lua.toNumber(e,base);
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214 }
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215
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216 public static String to_string(LuaState lua,Object v) throws LuaException {
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217 return lua.toString(v);
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218 }
2
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219 }